Die Cast EFI by Pass Style Fuel Pressure Regulators Black Die Cast Fuel Regulator, 60 PSI HolleyHolley does it again with their new die cast aluminum fuel pressure regulators. The same Holley quality that you expect at a price point that every budget can handle. 1 8 inch NPT barb fitting for boost reference port included. Features and Benefits: Die Cast aluminum construction 3 8 inch NPT Inlet, Outlet, and Return ports 1 8 inch NPT Gauge Port 1 8 inch NPT Boost Reference 1: 1 Associated Comments: The mounting holes in the regulator are not